Rivet



E. B. STIMPSON RIVET Filed sept.r 28 1921 Patented Get. 7, 1924..

` UNITE PATENT oF 'islam FICE.:

EDWIN B. STIMPSON, OF BROOKLYN, NEW YORK, ASSGNOR IO EDWIN B. STIMPSON COMPANY, OF BROOKLYN, NEW YORK. j

River.

Appucation'alea septembef 2s,v 1921.` serial nasoassi.

To all ill/110m may concern.' n

Be it known that I, EDWIN B. S'rnvirsoN, a citizen of the United States, residing at Brooklyn, in the county o f Kings and State of New i ork, have invented certain new and useful Improvements .in Rivets, of which the following is a specication.

Thislinvention relates to rivets of the sheet metal type and the objects of the invention are to provide a fastening of this character which will be light and strong and in which a. minimum amount of material will be used, so that with itsv other' advantages the device will be vquite inexpensive.

In the accompanying drawing I have illustrated various forms of the invention wherein these objects are accomplished, but do not wish to be understood as limiting the invention to these particular forms.

Figure `1 in the drawing referred to Vis a plan view of the rivet as it appears before the prongs are brought together in their final relation.

f Figure 2 is a cross sectional View through 25 the head of the rivet Aand showing one of the upstanding prongs. I

Figure-3 is a sectional view taken on substantially the plane of line 3-3 vof Figure 1. j Figure't is a plan view of the fastening 30 in its completed'jform.

Figure 5 is a sectional View on substantially the plane of line 5-5 of Figure 4.

Figure 6 is a side view of a modified form of thefrivet in partly completed icondition.

Figure 7 is a crosssectional view of the same in its completed form.

Figure 8 is a broken side view of another modification in uncompleted form.

Figure 9 is a cross sectional view of the same as completed. j

Figure 10 is a plan of another modification in uncomplete form.

Figure 11 isa cross sectional view of the completed embodiment of the same.

Figure 12 is a cross sectional view of another modication.

Figures 13 and lt are angularly related cross sectional views of a still further modi cation.

In all forms ofl the invention there is a domed or arched head 15 formed by cupping the body portion of a sheet metal blank, Also in the various forms disclosed there are two integral prongs 1,6, 17 attached at diametrically opposite or rim of the head. j

Another feature'in common is that in all the forms disclosed'the prongs have straight base portions 18, 1Q extending asa bridge across the cavity of the head, the `active portions of the prongs projecting from the center of thisbridge and the bridge being reinforced in most instances by a strut or struts to prevent it from collapsing into the hollow of the head. Y l

In the form vof the invention *shownJ in Figures 1 to 5 the bridge `formed 'by the parts 18, 19 is supported at the center by lugs 20 partially cutout ofthe material ofthe base parts'1819 and projecting back into engagement with the bottom of the cup (Figure 5). 'j

The active or penetrating portions of the prongs may be pointed asindicated at21 and these parts also may be archedtrans versely with their conca-vity to the outpoints tothe skirt "l y side, as indicated at 2 2, so that when` the i 18, 19 and set the points of the prongs at `an angle to such base portions, as indicated in dotted lines,fFigure 3. It willbe noted in Figure 2 that the bend 23 isE at substan- :tially the base of the cut-out tongues 20 iso that said tongues will swing with the points of the prongsand therefore project inward at a. right angle when the bend is made (Figure 3). The bases of the prongs are next bent at 24 at their junction with the rim of the head so as `to bring the points ois-projecting parts of the prongs back to back, with the struts 20 resting on the bottom of the cup, as shown in Figure 5. In this final position it will be seen that the point-s of the prongs brace each other. and

CTI

18, 19 project from the rim of the head straight to the center of the rivet, the struts 2O being taken from an excess of metal in these centralizing base portions.

In lFigures 6 and 7 I have shoivn hoiv the strut extending` into the back of the hollow head may be eliminated and a somewhat similar bracing effect be obtained by 'fastening the base portions of the prongs together With integral tongues 25, 26 partially cut Jfrom the Vbody portions of the prongs and clinched through the openings afforded bythe bending up of these lugs. The asteninggof thev prongs together in this Way, it will be seen, serves to transmit the thrust across the `base portions 18, 19 to the rim of the head.

The structure of Figures 8 and9- is generally similar to that last described, the main distinction being that the prongsare fastened together at their bases by bending lugs 27 at the edges of one of the prongs into notches 2S provided in the edges of the other prong.

In Figures 13 and 14, I have shown how this last structure may be Inodiiied to provide a thrust transmitting brace by cutting out a thrust lug 2O from betiveeenthe edges of the base portions of one ot' the prongs, .as in the irst form disclosed.

In the structureof Figures 10` and 11 .the bridging and centering portions 18, 19 are supported by a transversely extending brace 29 which is integrally attached tothe rim of the head at a point approximately mid- Way between the prongs and is bent across the cavity of the head beneath the base portions 18, 19, as shovvn in Figure 11. The free end of this brace may :be turned up or outward over the edge ot the rim as shown at 30.

In the form oit the invention shown in Figure 12, the thrust transmitting brace for the prongs is 'provided by indenting the center of the head into the form of a boss 31 standing beneath and operating as a support for the abutting rinner ends of the prongs. rIhis construction has the advantage oi" the others described in which a direct thrust transmitting connection is provided rom the base oi the prongs to the center of the head.

What I claim is;

1. A, one piece sheet metal fastening having an arched head with prongs having base portions integrally attached at the rim thereof, said base portions extending substantially straight across the .concavityof the arch and forming a bridge troni which the prongs project and an integral reinforcenient between said bridge and the Central portion of the arched head.

2. The structure of claim 1 in which the reinforcement is in the form'. of a ,direct thrust transmitting member. cut out ot the material of one of thevprongs. Y

3. rlhe structure of claim 1 With kintegral securing means fastening together the base portions of the prongs.-

t. A one piece sheet metal rivet construction having a cupped head With prongs having base portions integrally attached to the rim of said head, said base portions extending substantially straight across the concavity of the `cupped head kspaced away from the bottom Wall thereof, and means for holding said base portions in said spaced relation to the head.

5. A one piece sheet metal rivet construction having a cupped head with prongs having base portions integrally attached to the riln of said head, said base portions extending substantially straight across the concavity of the cupped head spaced avvay from the bottom Wall thereof, and means for holding said base portions in .said spaced relation and comprising interengaging` portions on the prongs fastening them together.

In testimony whereof I am); my signature.

EDI/VIN B. STIMPSON. 

